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Published in: BMC Musculoskeletal Disorders 1/2020

01-12-2020 | Osteoarthrosis | Research article

Cross-cultural translation, adaptation and validation of a Japanese version of the functional index for hand osteoarthritis (J-FIHOA)

Authors: Yasunobu Nakagawa, Shigeru Kurimoto, Emmanuel Maheu, Yuichiro Matsui, Yuri Kanno, Kunitaka Menuki, Masanori Hayashi, Tetsuya Nemoto, Takanobu Nishizuka, Masahiro Tatebe, Michiro Yamamoto, Katsuyuki Iwatsuki, Renée Liliane Dreiser, Hitoshi Hirata

Published in: BMC Musculoskeletal Disorders | Issue 1/2020

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Abstract

Background

Hand osteoarthritis (OA) has a wide spectrum of clinical presentations and physical function is one of the core domains where patients suffer. The Functional Index for Hand Osteoarthritis (FIHOA) is a leading assessment tool for hand OA-related functional impairment. Our objective was to make a Japanese version of FIHOA (J-FIHOA) and validate it among Japanese hand OA patients.

Methods

Forward and backward translation processes were completed to create a culturally adapted J-FIHOA. A prospective, observational multicenter study was undertaken for the validation process. Seventeen collaborating hospitals recruited Japanese hand OA patients who met the American College of Rheumatology criteria. A medical record review and responses to the following patient-rated questionnaires were collected: J-FIHOA, Hand20, Health Assessment Questionnaire (HAQ), numerical rating scale for pain (NRS pain) and Short Form 36 Health Survey (SF-36). We explored the structure of J-FIHOA using factor analysis. Cronbach’s alpha coefficients and item-total correlations were calculated. Correlations between J-FIHOA and other questionnaires were evaluated for construct validity. Participants in clinically stable conditions repeated J-FIHOA at a one- to two-week interval to assess test-retest reliability. To evaluate responsiveness, symptomatic patients who started new pharmacological treatments had a 1-month follow-up visit and completed the questionnaires twice. Effect size (ES) and standardized response mean (SRM) were calculated with pre- and post-treatment data sets. We assessed responsiveness, comparing ES and SRM of J-FIHOA with other questionnaires (construct approach).

Results

A total of 210 patients participated. J-FIHOA had unidimensional structure. Cronbach’s alphas (0.914 among females and 0.929 among males) and item-total correlations (range, 0.508 to 0.881) revealed high internal consistency. Hand20, which measures upper extremity disability, was strongly correlated with J-FIHOA (r = 0.82) while the mental and role-social components of SF-36 showed no correlations (r = − 0.24 and − 0.26, respectively). Intraclass correlation coefficient for test-retest reliability was 0.83 and satisfactory. J-FIHOA showed the highest ES and SRM (− 0.68 and − 0.62, respectively) among all questionnaires, except for NRS pain.

Conclusions

Our results showed J-FIHOA had good measurement properties to assess physical function in Japanese hand OA patients both for ambulatory follow-up in clinical practice, and clinical research and therapeutic trials.
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Metadata
Title
Cross-cultural translation, adaptation and validation of a Japanese version of the functional index for hand osteoarthritis (J-FIHOA)
Authors
Yasunobu Nakagawa
Shigeru Kurimoto
Emmanuel Maheu
Yuichiro Matsui
Yuri Kanno
Kunitaka Menuki
Masanori Hayashi
Tetsuya Nemoto
Takanobu Nishizuka
Masahiro Tatebe
Michiro Yamamoto
Katsuyuki Iwatsuki
Renée Liliane Dreiser
Hitoshi Hirata
Publication date
01-12-2020
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2020
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/s12891-020-03193-6

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